Formats Supported¶
| Format | Read | Write | Since version | Notes |
| PNG | Y | Y | 0.1 | |
| PNG (16 bits) | Y | Y | 0.4 | |
| TIFF | Y | Y | 0.1 | |
| JPEG | Y | Y | 0.1 | |
| WEBP | Y | N | 0.2 | |
| BMP | Y | N | 0.2.5 | Only uncompressed bitmaps are supported. |
| STK | Y | N | 0.2 | |
| LSM | Y | N | 0.2.2 | |
| XCF | Y | N | 0.2.2 | Only if xcf2png utility
is found in the path. |
Options¶
Some of the formats allow you to specify options when saving. These are inevitably format specific.
PNG¶
- png:compression_level
- Compression level to use, from 0 (no compression) to 9. Setting it to 0 is discouraged.
JPEG¶
- jpeg:quality
- An integer 1-100 determining the quality used by JPEG backend (default is libjpeg default: 75).
TIFF¶
- tiff:compress
- Whether to use compression when saving TIFF (default: True)
- tiff:horizontal-predictor
- Whether to use horizontal prediction in TIFF. This defaults to True for 16 bit images, and to False for 8 bit images. This is because compressing 16 bit images without horizontal prediction is often counter-productive (see http://www.asmail.be/msg0055176395.html)